[تم الحل] Can we change the default language slug?

Background of the issue:
I want to change the default language slug for my site. I want to change it from achieveimmigration.sg/zh-hans/ to achieveimmigration.sg/cn/ (for Chinese Simplified)

Symptoms:
No specific issue or error message mentioned.

Questions:
Is it possible to change the default language slug?
Can we change it to achieveimmigration.sg/cn/ (Chinese Simplified) instead of achieveimmigration.sg/zh-hans/?